Determine approximately the number of resulting classes if: a. A class interval of 5 is used for a range from 1 through 55.  b. A class interval of 5 is used for a range from 172 through 366.  c. A class interval of 3 is used for a range from 88 through 124.  d. A class interval of 10 is used for a range from 12 through 160.

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